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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity Gauges and Neck Turning?
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<blockquote data-quote="Mikecr" data-source="post: 1097183" data-attributes="member: 1521"><p>Making straight ammo involves more than necks. </p><p>Because of the way brass cases are made, thickness variance as seen at a neck runs full length of the case. Thickness variance = spring back variance. We add energy to brass when we size, and this is where spring back variance bows cases like a banana. So the only way to stop growing runout with each FL sizing, is to first cull out cases with any thickness variance at all.</p><p></p><p>With less & less sizing, runout grows at a slower rate. Those with fitted cases, that don't size them at all, will never see any runout -except that caused at necks and by bullet seating.</p><p>Neck turning removes thickness variance (in necks), and with this they'll spring back away from chamber neck evenly, to leave a nice round hole for straight bullet seating.</p><p>There are ways people screw up straight necks with their sizing. Dies and bushings and presses aren't perfect. Many have issues with their expander system. Mandrels are often better where there is excess sizing going on.</p><p>Wilson type inline dies remove the press from addition.</p><p></p><p>Of course there are other reasons for/against each attribute of neck turning & sizing in general.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1097183, member: 1521"] Making straight ammo involves more than necks. Because of the way brass cases are made, thickness variance as seen at a neck runs full length of the case. Thickness variance = spring back variance. We add energy to brass when we size, and this is where spring back variance bows cases like a banana. So the only way to stop growing runout with each FL sizing, is to first cull out cases with any thickness variance at all. With less & less sizing, runout grows at a slower rate. Those with fitted cases, that don't size them at all, will never see any runout -except that caused at necks and by bullet seating. Neck turning removes thickness variance (in necks), and with this they'll spring back away from chamber neck evenly, to leave a nice round hole for straight bullet seating. There are ways people screw up straight necks with their sizing. Dies and bushings and presses aren't perfect. Many have issues with their expander system. Mandrels are often better where there is excess sizing going on. Wilson type inline dies remove the press from addition. Of course there are other reasons for/against each attribute of neck turning & sizing in general. [/QUOTE]
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Concentricity Gauges and Neck Turning?
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